Where: Hidaka, Japan (42.9° N, 142.4° E: paleocoordinates 47.0° N, 131.7° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Hakobuchi Group, Maastrichtian (70.6 - 65.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; sandstone and fine-grained, sandy siltstone

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: I. Hayami. 1975. A systematic survey of the Mesozoic Bivalvia from Japan. The University Museum, The University of Tokyo, Bulletin (10) [M. Aberhan/S. Nurnberg/S. Nurnberg] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40604: authorized by Martin Aberhan, entered by Sabine Nürnberg on 26.06.2004